不同HZSM-5催化剂上苯与乙醇的烷基化反应  

ALKYLATION OF BENZENE WITH ETHANOL OVER DIFFERENT HZSM-5 CATALYSTS

作　　者：高俊华[1,2] 张立东[1,2] 胡津仙[1] 李文怀[1] 王建国[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100039

出　　处：《石油学报（石油加工）》2009年第1期59-65,共7页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：以正丁胺为模板剂、水玻璃为硅源、硫酸铝为铝源，采用水热晶化法合成出晶粒大小不同的ZSM-5分子筛，通过XRD、BET、SEM、NH3-TPD和Py-IR方法对催化剂进行了表征，并在连续流动固定床反应器上对其进行了苯与乙醇烷基化反应性能评价。结果表明，ZSM-5催化剂的酸性质是影响苯与乙醇烷基化反应中苯转化率和乙苯选择性的重要因素，晶粒大小在一定程度上对乙苯的选择性有影响。酸性弱、酸量少的小晶粒ZSM-5催化剂乙苯选择性和苯的转化率能同时达到最优。考察了操作条件对催化性能较好的小晶粒HZSM-5催化剂上苯与乙醇烷基化反应苯的转化率和乙苯选择性的影响，得到该催化剂的最佳反应条件：反应温度380℃，苯／醇摩尔比3～5，质量空速3～5h。The HZSM-5 catalysts with different crystal sizes were synthesized hydrothermally by using n butyl amine as template source, water glass as the silica source, aluminum sulphate as the alumina source. The HZSM-5 catalysts were characterized by XRD, BET, SEM, NHa-TPD, Py-IR. Alkylations of benzene with ethanol were carried out over the HZSM-5 catalysts in fixed bed reactor to evaluate their catalytic performance. The experimental results indicated that the acid properties of HZSM-5 were the main factor to affect the benzene conversion and ethylhenzene selectivity in the alkylation of benzene with ethanol, the crystal size affected only ethylbenzene selectivity in some way. The HZSM-5 of smaller crystal, weaker acid strength and fewer acid sites was the best one with high ethylbenzene selectivity and benzene conversion among the four HZSM-5 samples to catalyze the alkylation of benzene with ethanol, which was selected as the catalyst used in the alkylation reaction to discuss the influences of various reaction conditions on HZSM-5 catalyst performance. It is found that for this HZSM-5 catalyst the optimal alkylation reaction conditions were the temperature of 380℃, the MHSV of 3--5 h^-1 , the benzene/ethanol molar ratio of 3--5.

关 键 词：苯 乙醇 烷基化 HZSM-5 晶粒大小 

分 类 号：O643[理学—物理化学]